About the Aldenham Conservation Area
The Aldenham Conservation Area covers about 14 hectares and was designated by Hertsmere Borough Council in 1973. Inside the boundary are 6 listed buildings (1 Grade I, 5 Grade II). The most significant is Church of St John the Baptist, Grade I.
What changes inside the conservation area
Conservation areas are “Article 2(3) land”. You keep most permitted development rights, but these are removed or tightened.
ProjectElsewhereIn Aldenham CA
- Rear extensionElsewhere: 3 m · 6 m with PANo 6 m / 8 m prior approval
- Two-storey extensionElsewhere: 3 mNeeds planning permission
- Side extensionElsewhere: Half the widthNeeds planning permission
- Loft conversionElsewhere: 50 m³Needs planning permission
- Garden roomElsewhere: 2.5 m high by boundariesNot beside the house
- PorchElsewhere: 3 m²Same limits
- Solar panelsElsewhere: 0.2 m projectionSame limits
- Air source heat pumpElsewhere: 1 unitNot facing the road
- Fences, walls and gatesElsewhere: 2 m · 1 m by a roadSame limits
- External claddingElsewhere: Matching materialsNeeds planning permission
- Tree workElsewhere: No notice6 weeks’ notice to the council
- Demolition (over 115 m³)Elsewhere: AllowedNeeds planning permission
Limits for a semi-detached house under the GPDO 2015. An Article 4 direction can remove more.
Listed buildings in the conservation area
Any work affecting these needs listed building consent, inside or out. Each links to its entry on the National Heritage List.
- Church of St John the BaptistGrade I
- Aldenham Social ClubGrade II
- Burne Monument About 10 Metres North of Church of St John the BaptistGrade II
- Church Farm HouseGrade II
- Coningesby Monuments About 2 Metres East of Church of St John the BaptistGrade II
- Glebe PlaceGrade II
The council’s appraisal
WEBAldenham Conservation Area AppraisalHertsmere Borough Council’s description of the area’s character — what planners look at when you apply.Open on council site ↗Nearby conservation areas
Boundary and listed buildings from Hertsmere Borough Council and Historic England via planning.data.gov.uk (OGL). Guidance only — not an official council check.